In addition to $100 for your PS3 or Xbox 360, Microsoft now wants to offer $250 for your smartphone or tablet. There’s just one catch: the amount is credit only usable at the Microsoft Store.

As you can see, Microsoft is very keen on getting you to buy a Surface 2 with your smartphone or tablet money. You can buy whatever you want, though the deal is only valid until March 2, 2014, or “while supplies last.”

Before your rush off to take advantage, here is the fine print (we’ve highlighted the important parts):

To be eligible for trade in, product must power on and be in fully functional, working condition without broken/missing components, cracked display/housing or liquid damage, cannot be password protected, and include original chargers/accessories. Any appraised value will be determined at trade in and provided as store credit, subject to Microsoft’s discretion and approval.

All trade ins are final. Not valid on prior orders or purchases; cannot be transferred or otherwise redeemed for cash or gift cards. Not combinable with other offers. Discount does not include taxes, shipping or other fees. Void where prohibited or restricted by law. Microsoft reserves the right to modify or discontinue offers at any time. Limit 1 per trade in.

If you have an old smartphone or tablet lying around, this is a great deal. To take advantage of this offer, you’ll want to find your store (US and Canada only), and make sure the deal is available there before showing up in person.

Last year, Microsoft offered to buy your iPad for up to $200 towards the purchase of a Surface tablet, and then expanded the deal to the iPhone, BlackBerry devices, as well as Android phones and tablets. This year, the company seems to be targeting all smartphones and tablets, though we wouldn’t be surprised if device-specific deals were coming later.